Variable(displacement)pump
[化] 变量泵
🗣️ 情景例句
spend the entire weekend having a good time together here
一起渡过一个快乐的周末
The truest politeness comes from sincerity.
真正的殷勤出于真诚。
So the number of stars that we know exist is now estimated at about 300 million million million.
因此，我们所知道的现有恒星数目估计约有30亿×1000亿颗。